diff --git a/daemon/codec.c b/daemon/codec.c
index de691c63e..b15655bb5 100644
--- a/daemon/codec.c
+++ b/daemon/codec.c
@@ -1899,7 +1899,7 @@ static int codec_add_dtmf_packet(struct codec_ssrc_handler *ch, struct codec_ssr
 		ch->last_dtmf_event_ts = 0; // last DTMF event duration
 	}
 
-	unsigned long ts = fraction_divl(output_ch->encoder->next_pts, &output_ch->encoder->def->clockrate_fact);
+	unsigned long ts = fraction_divl(output_ch->encoder->next_pts, &output_ch->encoder->clockrate_fact);
 	// roll back TS to start of event
 	ts -= ch->last_dtmf_event_ts;
 	// adjust to output RTP TS
@@ -1924,8 +1924,8 @@ static int codec_add_dtmf_packet(struct codec_ssrc_handler *ch, struct codec_ssr
 		ts_delay = duration - ch->dtmf_first_duration;
 
 		// shift forward our output RTP TS
-		output_ch->encoder->next_pts = fraction_multl(ts + duration, &output_ch->encoder->def->clockrate_fact);
-		output_ch->encoder->packet_pts += fraction_multl(duration - ch->last_dtmf_event_ts, &output_ch->encoder->def->clockrate_fact);
+		output_ch->encoder->next_pts = fraction_multl(ts + duration, &output_ch->encoder->clockrate_fact);
+		output_ch->encoder->packet_pts += fraction_multl(duration - ch->last_dtmf_event_ts, &output_ch->encoder->clockrate_fact);
 		ch->last_dtmf_event_ts = duration;
 	}
 	payload_type = h->dtmf_payload_type;
@@ -3412,7 +3412,7 @@ static struct ssrc_entry *__ssrc_handler_transcode_new(void *p) {
 	ch->bitrate = h->dest_pt.bitrate ? : h->dest_pt.codec_def->default_bitrate;
 
 	format_t enc_format = {
-		.clockrate = fraction_mult(h->dest_pt.clock_rate, &h->dest_pt.codec_def->clockrate_fact),
+		.clockrate = h->dest_pt.clock_rate,
 		.channels = h->dest_pt.channels,
 		.format = -1,
 	};
@@ -3569,7 +3569,7 @@ static int packet_encoded_rtp(encoder_t *enc, void *u1, void *u2) {
 				memcpy(send_buf, buf, pkt_len);
 			}
 			__output_rtp(mp, ch, ch->handler, send_buf, inout.len, ch->first_ts
-					+ fraction_divl(enc->avpkt->pts, &enc->def->clockrate_fact),
+					+ fraction_divl(enc->avpkt->pts, &enc->clockrate_fact),
 					ch->rtp_mark ? 1 : 0, -1, 0,
 					payload_type, 0);
 			mp->ssrc_out->parent->seq_diff++;
diff --git a/daemon/media_player.c b/daemon/media_player.c
index 0ef94daed..901a81494 100644
--- a/daemon/media_player.c
+++ b/daemon/media_player.c
@@ -306,7 +306,7 @@ found:
 	// that has passed
 	if (mp->sync_ts_tv.tv_sec) {
 		long long ts_diff_us = timeval_diff(&rtpe_now, &mp->sync_ts_tv);
-		mp->sync_ts += fraction_divl(ts_diff_us * dst_pt->clock_rate / 1000000, &dst_pt->codec_def->clockrate_fact);
+		mp->sync_ts += fraction_divl(ts_diff_us * dst_pt->clock_rate / 1000000, &dst_pt->codec_def->default_clockrate_fact);
 	}
 
 	// if we already have a handler, see if anything needs changing
diff --git a/lib/codeclib.c b/lib/codeclib.c
index 39e761b20..71be917ec 100644
--- a/lib/codeclib.c
+++ b/lib/codeclib.c
@@ -259,7 +259,7 @@ static codec_def_t __codec_defs[] = {
 	{
 		.rtpname = "G722",
 		.avcodec_id = AV_CODEC_ID_ADPCM_G722,
-		.clockrate_fact = {2,1},
+		.default_clockrate_fact = {2,1},
 		.default_clockrate = 8000,
 		.default_channels = 1,
 		.default_ptime = 20,
@@ -415,7 +415,7 @@ static codec_def_t __codec_defs[] = {
 	{
 		.rtpname = "EVS",
 		.avcodec_id = -1,
-		.clockrate_fact = {3,1},
+		.default_clockrate_fact = {3,1},
 		.default_clockrate = 16000,
 		.default_channels = 1,
 		.default_ptime = 20,
@@ -749,11 +749,11 @@ decoder_t *decoder_new_fmtp(const codec_def_t *def, int clockrate, int channels,
 	if (!def->codec_type)
 		goto err;
 
-	clockrate = fraction_mult(clockrate, &def->clockrate_fact);
-
 	ret = g_slice_alloc0(sizeof(*ret));
 
 	ret->def = def;
+	ret->clockrate_fact = def->default_clockrate_fact;
+	clockrate = fraction_mult(clockrate, &ret->clockrate_fact);
 	format_init(&ret->in_format);
 	ret->in_format.channels = channels;
 	ret->in_format.clockrate = clockrate;
@@ -976,7 +976,7 @@ static int __decoder_input_data(decoder_t *dec, const str *data, unsigned long t
 	if (!data && (!dec->dtx.do_dtx || !ptime))
 		return 0;
 
-	ts = fraction_mult(ts, &dec->def->clockrate_fact);
+	ts = fraction_mult(ts, &dec->clockrate_fact);
 
 	cdbg("%p dec pts %llu rtp_ts %llu incoming ts %lu", dec, (unsigned long long) dec->pts,
 			(unsigned long long) dec->rtp_ts, (unsigned long) ts);
@@ -1136,10 +1136,10 @@ void codeclib_init(int print) {
 		}
 
 		// init undefined member vars
-		if (!def->clockrate_fact.mult)
-			def->clockrate_fact.mult = 1;
-		if (!def->clockrate_fact.div)
-			def->clockrate_fact.div = 1;
+		if (!def->default_clockrate_fact.mult)
+			def->default_clockrate_fact.mult = 1;
+		if (!def->default_clockrate_fact.div)
+			def->default_clockrate_fact.div = 1;
 		if (!def->default_ptime)
 			def->default_ptime = -1;
 		if (!def->default_clockrate)
@@ -1417,7 +1417,7 @@ int encoder_config(encoder_t *enc, const codec_def_t *def, int bitrate, int ptim
 }
 
 int encoder_config_fmtp(encoder_t *enc, const codec_def_t *def, int bitrate, int ptime,
-		const format_t *requested_format, format_t *actual_format,
+		const format_t *requested_format_p, format_t *actual_format,
 		struct rtp_codec_format *fmtp, const str *fmtp_string,
 		const str *extra_opts)
 {
@@ -1427,8 +1427,12 @@ int encoder_config_fmtp(encoder_t *enc, const codec_def_t *def, int bitrate, int
 	if (!def->codec_type)
 		goto err;
 
+	enc->clockrate_fact = def->default_clockrate_fact;
+	format_t requested_format = *requested_format_p;
+	requested_format.clockrate = fraction_mult(requested_format.clockrate, &enc->clockrate_fact);
+
 	// anything to do?
-	if (G_LIKELY(format_eq(requested_format, &enc->requested_format)))
+	if (G_LIKELY(format_eq(&requested_format, &enc->requested_format)))
 		goto done;
 
 	encoder_close(enc);
@@ -1436,9 +1440,9 @@ int encoder_config_fmtp(encoder_t *enc, const codec_def_t *def, int bitrate, int
 	if (ptime <= 0)
 		ptime = 20;
 
-	enc->requested_format = *requested_format;
+	enc->requested_format = requested_format;
 	enc->def = def;
-	enc->ptime = fraction_div(ptime, &def->clockrate_fact);
+	enc->ptime = fraction_div(ptime, &enc->clockrate_fact);
 	enc->bitrate = bitrate;
 
 	err = "failed to parse \"fmtp\"";
@@ -1673,7 +1677,7 @@ static int packetizer_samplestream(AVPacket *pkt, GString *buf, str *input_outpu
 			g_string_append_len(buf, (char *) pkt->data + input_output->len,
 					pkt->size - input_output->len);
 			enc->packet_pts = pkt->pts + input_output->len
-				* (fraction_mult(enc->def->bits_per_sample, &enc->def->clockrate_fact) / 8);
+				* (fraction_mult(enc->def->bits_per_sample, &enc->clockrate_fact) / 8);
 		}
 		return buf->len >= input_output->len ? 1 : 0;
 	}
@@ -1689,7 +1693,7 @@ static int packetizer_samplestream(AVPacket *pkt, GString *buf, str *input_outpu
 	// adjust output pts
 	enc->avpkt->pts = enc->packet_pts;
 	enc->packet_pts += input_output->len
-		* fraction_mult(enc->def->bits_per_sample, &enc->def->clockrate_fact) / 8;
+		* fraction_mult(enc->def->bits_per_sample, &enc->clockrate_fact) / 8;
 	return buf->len >= input_output->len ? 1 : 0;
 }
 
@@ -3194,7 +3198,7 @@ static const char *evs_decoder_init(decoder_t *dec, const str *extra_opts) {
 	dec->u.evs = g_slice_alloc0(evs_decoder_size);
 	if (dec->in_format.clockrate != 48000)
 		ilog(LOG_WARN, "EVS: invalid decoder clock rate (%i) requested",
-				fraction_div(dec->in_format.clockrate, &dec->def->clockrate_fact));
+				fraction_div(dec->in_format.clockrate, &dec->clockrate_fact));
 	if (dec->in_format.channels != 1)
 		ilog(LOG_WARN, "EVS: %i-channel EVS is not supported",
 				dec->in_format.channels);
@@ -3440,7 +3444,7 @@ static const char *evs_encoder_init(encoder_t *enc, const str *extra_opts) {
 	enc->u.evs.ind_list = g_slice_alloc(evs_encoder_ind_list_size);
 	if (enc->requested_format.clockrate != 48000)
 		ilog(LOG_WARN, "EVS: invalid encoder clock rate (%i) requested",
-				fraction_div(enc->requested_format.clockrate, &enc->def->clockrate_fact));
+				fraction_div(enc->requested_format.clockrate, &enc->clockrate_fact));
 	if (enc->requested_format.channels != 1)
 		ilog(LOG_WARN, "EVS: %i-channel EVS is not supported",
 				enc->requested_format.channels);
diff --git a/lib/codeclib.h b/lib/codeclib.h
index 217530a6c..8ce87d2df 100644
--- a/lib/codeclib.h
+++ b/lib/codeclib.h
@@ -160,7 +160,7 @@ INLINE long fraction_divl(long a, const struct fraction *f) {
 
 struct codec_def_s {
 	const char * const rtpname;
-	struct fraction clockrate_fact;
+	struct fraction default_clockrate_fact;
 	const int avcodec_id;
 	const char * const avcodec_name_enc;
 	const char * const avcodec_name_dec;
@@ -236,6 +236,7 @@ struct dtx_method_s {
 
 struct decoder_s {
 	const codec_def_t *def;
+	struct fraction clockrate_fact;
 	codec_options_t codec_options;
 	union codec_format_options format_options;
 	dtx_method_t dtx;
@@ -283,6 +284,7 @@ struct encoder_s {
 		 actual_format;
 
 	const codec_def_t *def;
+	struct fraction clockrate_fact;
 	codec_options_t codec_options;
 	encoder_callback_t callback;
 	union codec_format_options format_options;
diff --git a/recording-daemon/decoder.c b/recording-daemon/decoder.c
index 7a8e35c6e..1ac027f31 100644
--- a/recording-daemon/decoder.c
+++ b/recording-daemon/decoder.c
@@ -62,7 +62,7 @@ decode_t *decoder_new(const char *payload_str, const char *format, int ptime, ou
 
 	// decoder_new_fmt already handles the clockrate_mult scaling
 	int rtp_clockrate = clockrate;
-	clockrate = fraction_mult(clockrate, &def->clockrate_fact);
+	clockrate = fraction_mult(clockrate, &def->default_clockrate_fact);
 
 	// we can now config our output, which determines the sample format we convert to
 	format_t out_format = {